AER Lingus has ramped up the pressure on cabin crew refusing to work a new roster.

It started a series of one-on- one "investigation" meetings to exert more pressure on staff to sign up to the new rosters, introduced unilaterally by the company last week.

The airline has warned that if staff continued to refuse to operate the rosters they would face a disciplinary process that could ultimately lead to termination of their contracts and dismissal.

The disciplinary process includes an appeal mechanism and it was unclear how long it will take for any outcome to be known.

There was still no sign today of a resolution to the row today, with both sides appearing to become more entrenched.

In a message on its website today, Aer Lingus said it was endeavouring to operate a full schedule today but said there was the potential for some disruption arising out of the "ongoing industrial action" by cabin crew represented by Impact trade union.

So far, 175 staff have been taken off the payroll. Staff involved in the work to rule will be given the option of signing up to abide by the 850 annual flying hours requirement.